#include <iostream>
using namespace std;

void WriteHello();

int GetAge();

void WriteAge(int);

int main() {
    WriteHello();
    int age = GetAge();
    WriteAge(age);
}

void WriteHello() {
    cout << "你好\n";
}

int GetAge() {
    int age;
    cout << "请输入你的年龄: ";
    cin >> age;
    return age;
}

void WriteAge(int age) {
    cout << "你的年龄是 " << age << "\n";
}